Pencil-sharpener.



A BERTRAM PENCIL SHARPENER. APPLICATION-FILED JAN. 8, 1910.

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Patented June 20, 1911'.

A... BERTRAM. PENCIL SHARPENER. APPLICATION IILED'JA1L8, 1910.

995,764. Patented n 20, 1911.

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7n: NORRIS PETERS co., WASHINGTON, 0. c.

1T El AUGUST BERTRAM, OF NEW YORK, N. Y.

PENCIL-SHARPENER.

Specification of Letters Patent.

Patented June 20, 1911.

Application filed January 8, 1910. Serial No. 537,073.

To all whom it may concern:

Be it known that I, AUGUST BERTRAM, a citizen of the United States,residing in the borough of Brooklyn, county of Kings, city and State ofNew York, have invented certain new and useful Improvements in Pencil-Sharpeners, of which the following is a specification.

The object of my invention is to provide a pencil sharpener of a new andimproved form, by which pencils may be quickly and easily sharpened, andwhich may be quickly adjusted to form either short and blunt orelongated conical points.

An embodiment of said invention is fully shown in the followingspecification of which the accompanying drawings form a part, whereinsimilar numerals of reference designate like or equivalent partswherever found throughout the several views, and in which:

Figure 1 is a side view of my improved pencil-sharpener, a casing orcover, and cuttings-drawer being shown in dotted lines; Fig. 2 is afront view thereof without a casing; Fig. 3 is a top-view of the device,a casing being shown in dotted lines; Fig. 4 is a top-view on a slightlyenlarged scale, of a rotating pencil-clamp with a triangular topplate indotted lines, and Fig. 5 is a front View of an abrading-disk and anadjustable pointestop.

Referring to the drawing :-the reference numeral 11 designates theback-plate of the device, which is usually of cast-iron, and provided atthe bottom with the securing clamp and screw 12, by which the same maybe secured firmly in position for use to a suitable table or shelf.Located in suitable journals formed in and through the backplate 11, arethe drive shaft 13, provided on the outer end with the spur-gear wheel14, having usually the hand-crank 15, and the disk-shaft 16 provided onthe outer end with the small spur-gear wheel 17 meshing with the largerwheel 14 on the drive-shaft,

and provided on the inner end with the carrier-disk 18, which is rigidlysecured thereto, and rigidly secured in like manner to the inner end ofthe drive-shaft, is the wormgear 19, which meshes with the wormgearwheel 20, rigidly secured to the bottom of the tube 21 of thepencil-carrier 22. The pencil carrier 22, consists of a side-plate 23,having a tube 24 at the bottom by which the same is slidingly supportedupon the carrier supporting-rod 25 which is secured to or formedintegral wlth the back-plate 11. The tube 24 is provided at the rear endwith a screw-thread, and on this are placed an adjusting-nut 26, and acheck-nut 27, by proper adjustment of which the amount of slide upon thesupporting-rod may be limited, the adjusting-nut 26 being normally keptpressed against the back-plate by the spring 28, shown in Fig. 3.

Secured to the side-plate 23, by means of a screw-bolt 29 forming apivot-joint therefor, is the adjusting or rock-plate 30, and theside-plate 23 is provided with the adjust ing slot 31 through whichpasses the adjusting screw 32 which is screwed firmly into theside-plate 23, and by this screw it will be seen that the angle at whichthe two plates are set to one another may be varied at pleasure.

Secured to the top of the rock-plate 30, by means of suitable screws 35and 36, is the pencil-carrier top-bracket 34, through which projects soas to rotate freely therein the pencil carrier-tube 21, rotated by theworm-gear 19; and this top-bracket is provided on the rear edge with theguide-slot 37, coacting with the guide-bar 38 secured to or formedintegral with the back-plate to prevent vibration of the side-plate onthe rod 25, while permitting of free sliding movement of the samethereon. Rigidly secured to the pencil-carrier-tube 21 a short distancebelow the bracket 34 is the carrierplate 39, usually of the triangularform shown, provided with the upwardly extending pivot-studs 41 adjacentto the points thereof, on which are pivoted the carriercams 40, whichare usually of the shape shown in Fig. 4, each having the curved bindingend 40', and each being provided with an upwardly extending actuatingstud 44. These cams are covered and held in position by a loosecam-plate 45, usually of triangular form having slots 45 at the pointsfor the reception of the studs 44, and in order to keep this cam-platein position upon the cams, a washer-ring 10 is interposed between thesame and the top-bracket 34, as shown in Fig. 2.

One of the cam-studs 44 is usually made longer than the other two, andto this is secured one end of the cam-spring 43, the other end of whichspring is secured to the carrier-plate 39, usually by a screw 42; andthe action of this spring upon the cams through the cam-plate is suchthat the cams are all forced normally toward the center of thecarrier-tube 21, which is provided in the peripheral wall thereof withsuitable cam-openings 40, as clearly shown in Fig. 4, while a stoppin 43limits the movement of the same in the opposite direction.

Mounted upon and rotating with the carrier-disk 18, is the abrading-disk46, which may be a steel grinding-disk, with radial-file like teeth, anemery-disk, or merely a disk provided 011 its outer face or surface witha disk-facing of sandpaper 46 (Fig. 5) and such abrading-disk 46 issecured against rotation 011 the carrier-disk 18 in any desired manner,usually the studs on the disk 18 entering into sockets formed in therear face of the disk 46, (neither of which I have deemed it necessaryto show in the drawing) and by the pencil-cutter 47, which is screwedfirmly in position upon the carrier-disk 18, as soon as theabrading-disk 46 is placed in position thereon. This pencil-cutter, isof any desired form, usually of the common one shown in the drawing, anddiffering from those in common use, only in having at the rear end ascrew-threaded stud (not shown) provided with a left hand-screw thread,screwing into a like cavity in the center of the disk-shaft 16 uponwhich the carrierdisk 18 is rigidly mounted.

Formed integral with the back-plate 11 and extending forward therefromso that the front end thereof will be in line with the face of theabrading-disk 46, when all the parts are in position, as shown in Fig.1, is the point-stop-bracket 49, to the end of which is pivotallysecured by means of the pivot-screw 50, the point-stop 48, usually ofthe form shown, having the stop-face 48 upon which the pencil point willabut, as shown in Figs. 1 and 2 so as to prevent the pencil passing toofar downward, when being sharpened; and such point-stop has the workingor stop-face raised to and locked against movement beyond the desiredpoint, by means of the eccentric adjnsting-screwbolt 51, clearly shownin Figs. 2 and 5. By turning the bolt 51, its eccentric part causesbracket 49 to move to a higher or lower position with relation to disk46.

Covering the entire mechanism, is a removable cover-box 53 (shown indotted lines) having a hole at the top through which passes thecarrier-tube 21, and being provided at the front with a like orifice orhole 55, through which the pencil end may be passed into the cutter 47,on the first sharpening operation; and a removable dust drawer 54 isalso usually provided, in which falls by gravity the shavings from thecutter and the dust from the abrading-disk.

The operation of the device is as fol lows :-The parts being in theposition shown in the drawing, and properly adas to leave a conicalpoint, the pointed endof the pencil is then inserted in the carriertube21, and pressed down until the pencilpoint rests upon the stop-face 48of the point-stop 4S, and this insertion is made by rotating the pencilto the left, as the same ispushed down past carrier-cams 40, which willyield against the tension of the spring 43, when the pencil is sorotated, but will tightly grip the same when there is an attempt torotate the same in the opposite direction, that is to the right. Once inposition the actuation of the crank being continued, it will be seenthat the rapid rotation of the abrading-disk 46 against theconical-pencil point, which is being held firmly against the same by theaction of the spring 28 upon the side-plate 23, will grind 0H both thelead and some of the remaining wood thereof so as to form a smooth andperfect point, andthis more especially for the reason that as theabrading disk is being rotated to the left with great rapidity, thecarrier is at the same time being rotated in the same direction slowly,by the action on the gear-wheel 20 of the worm-gear 19, whereby theentire circumference of the conical point will be little by littlebrought into contact with the abrading disk, until the proper point hasbeen made.

It will be seen that the sharpness or bluntness of the point to be mademay be determined by raising or lowering the pointstop 48, by propermanipulation of the eccentric adjusting-screw 51, while the amount oftaper is usually determined by adjusting the carrier 22 to the propertilt, and then securing the same in such position by screwing theadjusting screw 32 firmly home so as to prevent any relative movementbetween the side-plate 23 and rock-plate 30; and that propermanipulation of the nuts 26 and 27, will adjust the device to use forsharpening pencils of large or small diameter, or to determine whetherthe peripheral or central portion of the abrading-disk is to do thework.

By this device while one pencil is having the wood removed by the cutter47 another may have its point being finished by the abrading-disk 46,and of course if desired any suitable means may be substituted for thehand-crank 15.

What I claim is 1. In a device of the class described, an abrading disk,a pencil-carrier having a sliding movement toward and from said disk,means for simultaneously rotating the disk and the carrier, means foryieldingly forcing the carrier toward the disk, and adj ustable meansfor varying the angle of the axis of rotation of the carrier.

2. In a device of the class described, a side-plate having a slidablysupported tube, a supporting-rod fitting in the said slidable tube, arock-plate pivoted to the side-plate, means for locking the side androck-plates against relative movement, a pencil-carrier revolublysupported by the rock-plate, an abrading-disk, means for simultaneouslyr0- tating the pencil-carrier-tube and the abrading-disk, means foryieldingly forcing the side plate and pencil carrier tube toward theabrading-disk upon the supporting-rod, and means for limiting the travelof the side-plate on such rod.

3. In a device of the class described, a side-plate having a slidablysupported tube, a supporting-rod fitting in the said slidable tube, arock-plate pivoted to the side-plate, means for locking the side androck-plates against relative movement, a pencil-carrier tube revolublysupported by the rockplate, an abrading-disk, means for simultaneouslyrotating the pencilcarrier tube and the abra'dingdisk, and means foryieldingly forcing the side-plate and pencilcarrier-tube toward theabrading disk upon the supporting rod.

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

AUGUST BERTRAM. lVitnesses:

D. ANTHONY UsINA, THOMAS F. WALLACE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

